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A letter of marque and reprisal (French: lettre de marque; lettre de course) was a government license in the Age of Sail that authorized a private person, known as a privateer or corsair, to attack and capture vessels of a foreign state at war with the issuer, licensing international military operations against a specified enemy as reprisal for a previous attack or injury. Captured naval prizes were judged before the government's admiralty court for condemnation and transfer of ownership to the privateer.
A common practice among Europeans from the late Middle Ages to the 19th century, cruising for enemy prizes with a letter of marque was considered an honorable calling that combined patriotism and profit. Such legally authorized privateering contrasted with unlicensed captures of random ships, known as piracy, which was universally condemned.[1] In practice, the differences between privateers and pirates were sometimes slight, even merely a matter of interpretation.[2][3]
The terms "letter of marque" and "privateer" were sometimes used to describe the ships which typically operated under the marque-and-reprisal licences. In this context, a letter of marque was a lumbering, square-rigged cargo carrier that might pick up a prize if the opportunity arose in its normal commerce. In contrast, the term privateer generally referred to a fighting vessel, fore-and-aft rigged, fast, and weatherly.[4]
Letters of marque allowed governments to fight their wars using mercenary private captains and sailors in place of their own navies as a measure to save time and money. Instead of building, funding, and maintaining a navy in times of peace, governments would wait until the start of a war to issue letters of marque to privateers, who financed their own ships in expectation of prize money.[5]